[Getdp] Problem with induction heat geometry

Matti Pellikka matti.pellikka at tut.fi
Sun Feb 3 12:56:14 CET 2013


Hi Stefan,

On 3 February 2013 01:41,  <stefan.braun at smartcae.de> wrote:
> Hi Matti,
> i have two additionally questions to the example.
> If i change the frequence from 50 to 5000 Hz i see no real skin effect.
> Could it be possible that the mesh is not fine enough?

Yes, you should have a couple of finite element layers per skin depth.
In this case, about ten times more elements in the radial direction
...

> My second questions is, how is it possible to integrate the temperature and
> the nonlinear mu curve.
> If found an example in the group
>
> http://www.geuz.org/pipermail/getdp/2000/000111.html
> http://geuz.org/pipermail/getdp/2000/000125.html
>
> but the attachment of the working file in 000125.html is missing.
>

For nonlinear mu curve you can study the example at
https://geuz.org/trac/getdp/wiki/MagnetoStaticsNonLinear (username:
getdp, password: getdp). With nonlinearity however, the eddy current
problem is no longer strictly time harmonic. Transient analysis should
be used instead.

https://geuz.org/trac/getdp/wiki/ChainedResolutions is a simple
example how to couple two problems, for example thermal and magnetic.

>
> Thank you very much for your help.
> Best regards,
> Stefan Braun
>
>
>

-- 

Matti Pellikka, Researcher
Tampere University of Technology, Electromagnetics

>
>
>
>
>
> On Tuesday, January 29, 2013 11:53:49 PM UTC+1, stefan... at smartcae.de wrote:
>>
>> Hi Matti,
>> thank you for your help. Now it works.
>> Best regards,
>> Stefan Braun
>>
>> SmartCAE, Munich
>>
>> On Tuesday, January 29, 2013 5:03:18 PM UTC+1, Matti Pellikka wrote:
>>>
>>> Hi,
>>>
>>> I was able to reproduce the issue with the latest nightly build on 64
>>> bit Windows 7. I'm investigating the issue, but as a temporary fix,
>>> running the mesher from Windows Command Prompt seems to work.
>>>
>>> Open the Windows Command Prompt and go to the directory where both
>>> gmsh.exe and indheat.geo are. Run the command:
>>>
>>> gmsh indheat.geo -3
>>>
>>> This creates the mesh file indheat.msh, which you can examine normally
>>> using the graphical interface of Gmsh. To solve the induction heating
>>> problem, have getdp.exe, indheat.pro and indheat.msh in the same
>>> directory and in that directory run in the Command Prompt the command
>>>
>>> getdp indheat.pro -solve MagDynTOComplex -pos MagDynTO
>>>
>>> You can examine the resulting .pos files using the graphical interface of
>>> Gmsh.
>>>
>>> Best regards,
>>>
>>> --
>>> Matti Pellikka, Researcher
>>> Tampere University of Technology, Electromagnetics
>>>
>>>
>>> On 29 January 2013 13:12,  <stefan... at smartcae.de> wrote:
>>> > Hello Matti,
>>> > thank you very much for your help.
>>> > I tried the new build 2.6.2 gmesh and the bulid of getdp 2.2.2 and i
>>> > come
>>> > little bit further.
>>> > I have no error messages and the mesher starts.
>>> > When the mesher reaches reducing cell complex the mesher crashes.
>>> > Do you have any idea how to solve this problem,
>>> > Thank you very much,
>>> >
>>> > Best regards,
>>> > Stefan Braun
>>> >
>>> > SmartCAE, Munich
>>> >
>>> > On Monday, January 28, 2013 10:02:52 AM UTC+1, Matti Pellikka wrote:
>>> >>
>>> >> Hi Stefan,
>>> >>
>>> >> The cohomology computation commands on those lines didn't make it to
>>> >> the current release version 2.6.1 of Gmsh. However, those commands
>>> >> should be available in tomorrow's nightly builds of the development
>>> >> version.
>>> >>
>>> >> Alternatively, you can compile the current development version by
>>> >> yourself, check that the build option ENABLE_KBIPACK is ON to enable
>>> >> the cohomology computation.
>>> >>
>>> >> I suspect that you also need the latest development version of GetDP
>>> >> to compute the example.
>>> >>
>>> >> --
>>> >> Matti Pellikka, Researcher
>>> >> Tampere University of Technology, Electromagnetics
>>> >>
>>> >> On 27 January 2013 00:57,  <stefan... at smartcae.de> wrote:
>>> >> > Hello Group Members,
>>> >> > i want to try out a example of onelab.info about induction heating.
>>> >> >
>>> >> > If i import the *.geo file in gmsh i get the following error
>>> >> > messages.
>>> >> >
>>> >> >
>>> >> > http://onelab.info/files/getdp/Magnetodynamics/GMSH_GETDP/indheat.geo
>>> >> >
>>> >> >
>>> >> > Info    : Reading 'C:\...\indheat.geo'...
>>> >> > Info    : Starting subloop 1 in Line Loop 543 (are you sure about
>>> >> > this?)
>>> >> > Error   : 'C:\...\indheat.geo', line 176 : syntax error (()
>>> >> > Error   : 'C:\...\indheat.geo', line 177 : syntax error (()
>>> >> > Error   : 'C:\...\indheat.geo', line 186 : syntax error (()
>>> >> > Error   : 'C:\...\ndheat.geo', line 187 : syntax error (()
>>> >> >
>>> >> >
>>> >> >
>>> >> > Thank you very much help on this problem.
>>> >> > Best regards,
>>> >> > Stefan Braun
>>> >> >
>>> >> > SmartCAE, Munich
>>> >> >
>>> >> > _______________________________________________
>>> >> > getdp mailing list
>>> >> > ge... at geuz.org
>>> >> > http://www.geuz.org/mailman/listinfo/getdp
>>> >> >
>>> >>
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